Screen bouncing 😢

I have recently beginning to have a screen bouncing issue. Seems to be getting worse. Started about 5 days ago.

Tried factory reset, safe mode and tried android M but still the same.

What is causing this maybe? Don't want to get a new phone as still loving this. Longest phone I've ever had.

Here's a video of what I mean https://youtu.be/qtsouaLdqgc

Thanks